CN115849760A - Early-strength polycarboxylate superplasticizer and preparation method thereof - Google Patents
Early-strength polycarboxylate superplasticizer and preparation method thereof Download PDFInfo
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- 229920005646 polycarboxylate Polymers 0.000 title claims abstract description 28
- 239000008030 superplasticizer Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000178 monomer Substances 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 239000002253 acid Substances 0.000 claims abstract description 18
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 11
- 239000012986 chain transfer agent Substances 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 5
- HVBSAKJJOYLTQU-UHFFFAOYSA-N 4-aminobenzenesulfonic acid Chemical compound NC1=CC=C(S(O)(=O)=O)C=C1 HVBSAKJJOYLTQU-UHFFFAOYSA-N 0.000 claims description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- POVITWJTUUJBNK-UHFFFAOYSA-N n-(4-hydroxyphenyl)prop-2-enamide Chemical compound OC1=CC=C(NC(=O)C=C)C=C1 POVITWJTUUJBNK-UHFFFAOYSA-N 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 4
- 125000002768 hydroxyalkyl group Chemical group 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims description 2
- JHUFGBSGINLPOW-UHFFFAOYSA-N 3-chloro-4-(trifluoromethoxy)benzoyl cyanide Chemical compound FC(F)(F)OC1=CC=C(C(=O)C#N)C=C1Cl JHUFGBSGINLPOW-UHFFFAOYSA-N 0.000 claims description 2
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- 229920000954 Polyglycolide Polymers 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 229930003268 Vitamin C Natural products 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims description 2
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 2
- 239000004633 polyglycolic acid Substances 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 235000015424 sodium Nutrition 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims description 2
- 229940001584 sodium metabisulfite Drugs 0.000 claims description 2
- 235000010262 sodium metabisulphite Nutrition 0.000 claims description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 2
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 claims description 2
- BWYYYTVSBPRQCN-UHFFFAOYSA-M sodium;ethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=C BWYYYTVSBPRQCN-UHFFFAOYSA-M 0.000 claims description 2
- 229950000244 sulfanilic acid Drugs 0.000 claims description 2
- 235000019154 vitamin C Nutrition 0.000 claims description 2
- 239000011718 vitamin C Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- -1 hydroxyalkyl acrylanilide Chemical compound 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Macromonomer-Based Addition Polymer (AREA)
Abstract
The invention relates to an early strength type polycarboxylate superplasticizer and a preparation method thereof, wherein the early strength type polycarboxylate superplasticizer comprises the following raw materials: the early strength functional monomer, the ether macromonomer, the sulfonic acid functional monomer and the unsaturated acid are mixed according to the mass ratio of (5-20) to (100-300) to (1-5) to (10-30); the structural formula of the early strength functional monomer is as follows：
R 1 、R 2 Is H or CH 3 (ii) a n is an integer of 1 to 10. The early-strength polycarboxylate superplasticizer prepared by the invention can give consideration to both the initial water reducing rate and slump retentivity while providing an early-strength function. Meanwhile, by introducing the ether macromonomer, the molecular chain of the water reducer is introduced with longer side chains, so that the prepared early-strength polycarboxylate water reducer has a comb-shaped structure with alternate long and short side chains, and has a higher water reducing rate while having an early-strength effect.
Description
Technical Field
The invention relates to the field of additives, and particularly relates to an early-strength polycarboxylate superplasticizer and a preparation method thereof.
Background
The concrete prefabricated part has the advantages of green construction, advanced building quality control, standardized production and the like, and is one of important ways for realizing building industrialization. Particularly, with the rapid development of housing industrialization and infrastructure, the demand of prefabricated parts is greater, and the early strength technology matched with the prefabricated parts is one of the key foundations and the pushing force for the concrete progress of the prefabricated parts. The early-strength polycarboxylate superplasticizer has the advantages of small mixing amount, high water reducing rate, capability of improving the early strength of concrete and the like, and is a hotspot of current research. In particular, the coordinated development of high early strength, good fluidity and high durability of concrete has also raised higher demands.
Therefore, more early strength type polycarboxylate water reducers need to be developed in the whole industry, the early strength of the concrete can be improved, the late strength of the concrete is not influenced, and the early strength type polycarboxylate water reducers have important significance on different projects such as quick repair, prefabricated parts and low-temperature construction.
Disclosure of Invention
Aiming at the prior art, the invention develops an early-strength polycarboxylate superplasticizer and a preparation method thereof, and the prepared polycarboxylate superplasticizer can give consideration to both initial water reducing rate and slump retentivity while providing an early-strength function.
Based on the above, the invention provides an early strength type polycarboxylate superplasticizer which comprises the following raw materials: the early strength functional monomer, the ether macromonomer, the sulfonic acid functional monomer and the unsaturated acid are mixed according to the mass ratio of (5-20) to (100-300) to (1-5) to (10-30);
the structural formula of the early strength functional monomer is as follows:
R 1 、R 2 is H or CH 3 (ii) a n is an integer of 1 to 10.
Further, the early strength functional monomer is prepared by esterifying hydroxyalkyl acrylanilide and polyethylene glycol acid, and the molar ratio n (Hydroxyalkylacrylamides) :n (Polyglycolic acid) 1 = (1.05-1.1): 1; the hydroxyalkyl acrylimide is 4-hydroxy-2-methacrylimide or N-p-hydroxyphenyl acrylamide.
Further, the ether macromonomer is at least one of methyl allyl polyoxyethylene ether and allyl polyoxyethylene ether; the molecular weight of the ether macromonomer is 4000-6000.
Further, the sulfonic acid functional monomer is at least one of sodium vinylsulfonate, sulfanilic acid, sodium styrene sulfonate, sodium allylsulfonate, sodium methallylsulfonate, sodium 2-acrylamide-2-methylpropanesulfonate and potassium 3-propyl-2-enoyloxypropane-1-sulfonate.
Further, the unsaturated acid is at least one of acrylic acid, methacrylic acid, maleic anhydride and itaconic acid.
Further, the raw material of the early strength type polycarboxylate superplasticizer also comprises a chain transfer agent, a reducing agent and an oxidizing agent.
Further, the chain transfer agent is at least one of thioglycolic acid and thioglycol.
Further, the reducing agent is at least one of vitamin C, ferrous sulfate and sodium metabisulfite.
Further, the oxidant is at least one of hydrogen peroxide, sodium persulfate, potassium persulfate and ammonium persulfate.
The second purpose of the invention is to provide a method for preparing the early-strength polycarboxylate superplasticizer, which at least comprises the following steps,
adding the early strength functional monomer, the ether macromonomer and the oxidant into water, stirring and dissolving, adding alkali liquor to adjust the pH value of the solution to 8-9, and preparing a mixed solution A; respectively and simultaneously adding a chain transfer agent, a reducing agent, unsaturated acid and a sulfonic acid functional monomer into the mixed solution A at normal temperature, feeding for 2-3h, then preserving heat for 1-2h, adding alkali liquor after heat preservation is finished, adjusting the pH to 6-8, adding water, and adjusting the solid content of the solution to 50% to obtain the polycarboxylic acid water reducer.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, the early strength functional monomer is introduced into the molecular chain of the polycarboxylic acid water reducing agent, namely, the rigid benzene ring, the amide and the ester group with strong hydrophobicity are introduced into the molecular chain of the water reducing agent, so that the HLB value of the polycarboxylic acid molecule can be changed while the early strength function is provided, and the initial water reducing rate and the slump retentivity are considered at the same time.
2. According to the invention, sulfonic acid functional monomers are introduced, and the introduced sulfonic group is hydrolyzed under alkaline conditions to obtain uniformly distributed polyamine groups, so that the formation of hydration products can be promoted, and the early strength of the concrete can be improved.
3. According to the invention, long side chains are introduced into the molecular chain of the water reducing agent through the ether macromonomer, so that the prepared early-strength polycarboxylate water reducing agent has a comb-shaped structure with alternate long and short side chains, and has a high water reducing rate while having an early-strength effect.
4. The method for preparing the early-strength polycarboxylate superplasticizer is simple, and the product has stable structure and excellent product performance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The experimental procedures in the following examples are conventional unless otherwise specified. Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example 1
Adding the early strength functional monomer, the ether macromonomer and the oxidant into water, stirring and dissolving, adding alkali liquor to adjust the pH value of the solution to 9, and preparing a mixed solution A; and respectively and simultaneously adding a chain transfer agent, a reducing agent, unsaturated acid and a sulfonic acid functional monomer into the mixed solution A at normal temperature, feeding for 2 hours, then preserving heat for 1 hour, adding alkali liquor after the heat preservation is finished, adjusting the pH value to 8, adding water, and adjusting the solid content of the solution to 50% to obtain the polycarboxylic acid water reducer. Wherein, the early strength functional monomer is prepared by esterifying hydroxyalkyl acryloyl aniline and polyethylene glycol.
Wherein, the early strength functional monomer is prepared by esterifying hydroxyalkyl acryloyl aniline and polyethylene glycol.
The amounts of the respective substances are shown in tables 1 and 2 in parts by mass.
Meanwhile, the component materials and the amounts of the components of the examples 2 to 4 are shown in tables 1 and 2, and the preparation method is the same as that of the example 1.
TABLE 1
TABLE 2
| Hydroxy alkyl acrylyl aniline | Methoxy polyethylene glycol acid | |
| A1 | 4-hydroxy-2-methacrylanilide | n＝2 |
| A2 | 4-hydroxy-2-methacrylanilide | n＝7 |
| A3 | N-p-hydroxyphenyl acrylamide | n＝4 |
| A4 | N-p-hydroxyphenyl acrylamide | n＝9 |
The water reducing agent used in comparative example 1 is a Point-400S polycarboxylic acid type high performance water reducing agent produced by Jie New Material group, inc., of the family.
Comparative example 2 differs from example 2 in that A2 is not added.
Comparative example 3 differs from example 3 in that no sodium styrene sulfonate was added.
Testing of concrete Properties
The compressive strength is measured according to GB/T50081-2002 standard of test method for mechanical properties of common concrete, and the concrete mixing proportion is as follows: 380kg/m cement 3 80kg/m of fly ash 3 50kg/m of mineral powder 3 750kg/m of sand 3 980kg/m of stone 3 160kg/m of water 3 。
The results of the experiment are shown in table 3.
TABLE 3
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered as being included in the description of the present specification.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The early-strength polycarboxylate superplasticizer is characterized by comprising the following raw materials: the adhesive comprises an early strength functional monomer, an ether macromonomer, a sulfonic acid functional monomer and unsaturated acid, wherein the mass ratio of the early strength functional monomer to the ether macromonomer to the sulfonic acid functional monomer to the unsaturated acid is (5-20): (100-300): (1-5): (10-30);
the structural formula of the early strength functional monomer is as follows:
R 1 、R 2 is H or CH 3 (ii) a n is an integer of 1 to 10.
2. The early strength type polycarboxylate superplasticizer according to claim 1, characterized in that: the early-strength functional monomer is prepared by esterifying hydroxyalkyl acrylidine and polyethylene glycol acid, and the molar ratio n (Hydroxyalkylacrylamides) :n (Polyglycolic acid) 1 = (1.05-1.1): 1; the hydroxyalkyl acrylimide is 4-hydroxy-2-methacrylimide or N-p-hydroxyphenyl acrylamide.
3. The early strength type polycarboxylate superplasticizer according to claim 1, characterized in that: the ether macromonomer is at least one of methyl allyl polyoxyethylene ether and allyl polyoxyethylene ether; the molecular weight of the ether macromonomer is 4000-6000.
4. The early strength type polycarboxylate superplasticizer according to claim 1, characterized in that: the sulfonic acid functional monomer is at least one of sodium vinylsulfonate, sulfanilic acid, sodium styrene sulfonate, sodium allylsulfonate, sodium methallylsulfonate, sodium 2-acrylamide-2-methylpropanesulfonate and potassium 3-propyl-2-enoyloxypropane-1-sulfonate.
5. The early strength type polycarboxylate superplasticizer according to claim 1, characterized in that: the unsaturated acid is at least one of acrylic acid, methacrylic acid, maleic anhydride and itaconic acid.
6. The early strength type polycarboxylate superplasticizer according to claim 1, characterized in that: the raw material of the early-strength polycarboxylate superplasticizer further comprises a chain transfer agent, a reducing agent and an oxidizing agent.
7. The early strength polycarboxylate water reducer according to claim 6, characterized in that: the chain transfer agent is at least one of thioglycolic acid and thioglycollic acid.
8. The early strength polycarboxylate water reducer according to claim 6, characterized in that: the reducing agent is at least one of vitamin C, ferrous sulfate and sodium metabisulfite.
9. The early strength polycarboxylate water reducer according to claim 6, characterized in that: the oxidant is at least one of hydrogen peroxide, sodium persulfate, potassium persulfate and ammonium persulfate.
10. The method for preparing the early strength type polycarboxylate superplasticizer according to any one of claims 1 to 9, characterized by comprising the following steps: at least comprises the following steps of,
adding the early strength functional monomer, the ether macromonomer and the oxidant into water, stirring and dissolving, adding alkali liquor to adjust the pH value of the solution to 8-9, and preparing a mixed solution A; respectively and simultaneously adding a chain transfer agent, a reducing agent, unsaturated acid and a sulfonic acid functional monomer into the mixed solution A at normal temperature, feeding for 2-3h, then preserving heat for 1-2h, adding alkali liquor after heat preservation is finished, adjusting the pH to 6-8, adding water, and adjusting the solid content of the solution to 50% to obtain the polycarboxylic acid water reducer.
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| CN115849760B (en) | 2023-12-01 |
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